Rivermatics

USGS Streamgage 11044250

Rainbow C near Fallbrook, CA

Rainbow C near Fallbrook, CA is USGS streamgage 11044250 in California, monitoring river discharge in hydrologic subbasin 18070302. It drains a watershed of about 10 square miles. Discharge records at this site go back to 1989. Typical flow runs near 0.1 cfs in July and 0.8 cfs in April, with the higher of the two arriving in April. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.

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Gauge details

State
California
Drainage area
10 sq mi
Gauge elevation
531 ft
Subbasin (HUC-8)
18070302
Coordinates
33.40753, -117.20086
USGS site number
11044250
Records begin
1989-11-01 (37 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Rainbow C near Fallbrook, CA. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0

All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 37 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 0.1 0.7 20.8
February 0.1 1.4 23.7
March 0.1 1.5 16.3
April 0 0.8 6.4
May 0 0.4 2.2
June 0 0.2 1.2
July 0 0.1 0.6
August 0 0.1 0.5
September 0 0 0.7
October 0 0.1 1
November 0 0.2 1.6
December 0 0.4 4.1

All values in cubic feet per second (cfs).

Common questions

When does Rainbow C near Fallbrook, CA normally run highest?
March, on the long-term record. The median daily flow that month is about 1.5 cfs, against 0 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Rainbow C near Fallbrook, CA?
It depends on the month. In January, half of days historically fall near 0.7 cfs, with the middle 80% of days between 0.1 and 20.8 cfs. The month-by-month table on this page gives the full range.
How long has Rainbow C near Fallbrook, CA been measured?
Discharge records at USGS site 11044250 begin in 1989, about 37 years, covering roughly 9,130 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Rainbow C near Fallbrook, CA?
Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
Where is Rainbow C near Fallbrook, CA?
The gauge sits at 33.40753, -117.20086, in California, in hydrologic subbasin 18070302, at an elevation of about 531 feet, draining roughly 10 square miles.
Can I use Rainbow C near Fallbrook, CA data for flood or safety decisions?
No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.

Other gauges in this subbasin